When psychologists talk of focusing on a particular stimulus, what are they referring to?

Question

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Focusing on a particular stimulus is known as selective attention, which is the ability to focus on one particular task or stimulus while ignoring others. Sensory awareness refers to the ability to perceive and process sensory information, while stream of thought refers to the continuous flow of thoughts through the mind. While all of these are related to the concept of focusing, selective attention is the most specific and accurate term.

When Psychologists Talk of Focusing on a Particular Stimulus, What